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300-420 · Question #312

A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single A

The correct answer is D. Make each spoke site router a stub router. E. Summarize the routes from spokes to the hubs.. To optimize EIGRP routing in a hub-and-spoke topology with a single AS and disabled auto-summarization, configure spoke routers as stub routers and summarize routes from the spokes at the hub.

Advanced Addressing and Routing Solutions

Question

A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS, and auto-summarization is disabled. Which two actions must the company choose? (Choose two.)

Options

  • ASplit the network into two separate ASs.
  • BExchange all routes between locations.
  • CSummarize the routes between the hubs.
  • DMake each spoke site router a stub router.
  • ESummarize the routes from spokes to the hubs.

How the community answered

(26 responses)
  • A
    12% (3)
  • B
    4% (1)
  • C
    4% (1)
  • D
    81% (21)

Why each option

To optimize EIGRP routing in a hub-and-spoke topology with a single AS and disabled auto-summarization, configure spoke routers as stub routers and summarize routes from the spokes at the hub.

ASplit the network into two separate ASs.

Splitting the network into two separate ASs would add unnecessary complexity and goes against the requirement of having all locations within a single EIGRP AS.

BExchange all routes between locations.

Exchanging all routes without summarization would lead to excessively large routing tables, increased convergence times, and higher resource consumption, which is inefficient for a large hub-and-spoke network.

CSummarize the routes between the hubs.

Summarizing routes between the hubs is not the primary optimization point; the focus should be on summarizing the numerous granular routes originating from the spokes to reduce the overall routing table size.

DMake each spoke site router a stub router.Correct

Making each spoke site router a stub router reduces their processing overhead by limiting query scope and prevents them from being transit points for network traffic, improving stability.

ESummarize the routes from spokes to the hubs.Correct

Summarizing routes from the spoke sites toward the hubs minimizes the size of routing tables on the hub routers, reduces EIGRP update traffic, and enhances overall network scalability and efficiency.

Concept tested: EIGRP hub-and-spoke optimization

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-stub-rt.html

Topics

#EIGRP#Route Summarization#Hub-and-Spoke#EIGRP Stub

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